PERFORMANCE EVALUATION OF QUALITY OF SERVICE IN HETEROGENEOUS NETWORKS USING OPNET MODELLER

The aim of next generation wireless network (NGWN) is to integrate different wireless access technologies such as WLAN, WiMAX, UMTS etc., each with its own characteristics, into a common IP-based core network to provide mobile user with seamless connectivity. One of the major issues for the converged heterogeneous networks is to provide seamless connectivity with QoS support. In this paper we simulated various wireless networks (WLAN, WiMAX and UMTS) for various applications and evaluated their performance as individual as well as in integrated mode.